State prosecutors are seeking an arrest warrant for a National Assembly member over bribery charges.
Ruling Saenuri Party representative Cho Hyun-ryong is suspected of taking more than 150-thousand U.S. dollars from local train parts supplier, Sampyo E&C, in return for awarding the company lucrative contracts.
The prosecution accuses Cho of taking money from the Korea Rail Network before and after he was elected as a lawmaker in 2012.
It represents the first such case since President Park pledged to root out corruption among public and elected officials in wake of April's Sewol-ho ferry disaster.
Collusive ties between regulators and the operator of the ferry have been blamed for its sinking.
It's common in Korea for retired bureaucrats to be hired by companies and public institutions that expect them to pressure their former colleagues or subordinates to ignore corrupt or irregular practices at the organizations.
As of now, one sitting representative from the ruling party and three from the main opposition New Politics Alliance for Democracy are under suspicion of receiving bribes. Connie Kim, Arirang News.